Remember the lack
of bidirectional navigation in our document windows?
The problem is that you can go down in the
folder hierarchy with the file system until you open a
file, but you cannot go up from the document
app to visit the file system again.

I just made a little patch for Evince to add an
"Open Containing Folder" command, similar to
the one that Firefox has in its Downloads window.

Unfortunately, Nautilus currently seems to have a bug. If you launch
"nautilus file:///blah/blah/foo.pdf",
Nautilus complains that "foo.pdf is not a folder". I'm
sure this worked at some point before — you could
make Nautilus open a window showing a folder *with* a certain
file already selected.

In the meantime, my patch for Evince just causes
Nautilus to open a folder window. It would be nice if
it could also select the file in that window.